Goes back way before Christianity, but that is besides the matter. Ok so our circumsolar orbit and our normal lunar orbit are the same as Earths so we can use that data instead of figuring it out. We'll just need to figure out the second moon, and the second star then really.

I say we increase the velocity of the second moon slightly so that it completes its travel around the world a maybe half a day or a day shorter. This is assuming of course that it is on the same orbital path as the real moon. So lets say our fake moon completes it's orbit at 26.5 days on the dot. We could also slow it so that it completes at 28 days on the dot. (for reference the earths moon takes 27.32 days)